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Inbox OSS raises $12M Series A

Led by Foundation Capital, with participation from existing investors.

SQ

Saqib Qureshi

CEO · July 22, 2025 · 4 min read

Today we are announcing our $12M Series A, led by Foundation Capital with participation from our existing investors. The funding will accelerate three things: the open-source platform, the deliverability tooling, and our customer engineering team.

We chose Foundation because they understand infrastructure. Their portfolio includes some of the most respected names in developer tools, and the partner team has deep operational experience in scaling SaaS platforms.

The vision has not changed: an email platform that respects developers, treats deliverability as a product, and prices fairly. We are just going to ship it faster.

Start sending email in under 5 minutes.

Free plan includes 3,000 emails/month forever. No credit card required.